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I think I have the solution for ya. In a lot of GM's the security fails. and when it does it will not allow car to start. I know a module that can bypass it and for a very reasonable price and u can install yourself! check it out and see if this is it

The crankshaft position sensor is located on the right-side (passenger side) of the engine. At the rear of the engine, behind the starter. You need to remove the starter to remove the crank sensor. Remember to disconnect the battery first. The starter can short against the cross member.

it sounds like a fuel pump .remove the fuel inspection cap on the fuel rail at the top of the engine and make a pump presser check,must be around 45-65 psi, anything lower means a defected pump.another way
of checking a pump is banging on the fuel tank while having some body cranking the eng. if the eng fires up it means it is a pump.

You need to check the crank sensor, this controls tthe injector pulse. If it will attempt to start with alternate fuel but not on its own, it sounds like the injectors arent pulsing, so your not getting fuel. Try the crank sensor first.

first check fuel presser, and fuel pump, if fuel presser low than 4 psi it won't be good idle or good revs when accelerating, fuel presser should need to be more than 4 psi and lower than 6psi, if not, the fuel presser fault, you have to drive your car to Mercedes workshop for diagnose because it's very hard to say what's the wrong many sensors are related to the fuel injection system and ignition system like crank sensor cam sensors knock sensors oxygen sensors ect. some time there are no any fault codes, it mean not completely faulty, but experience technician can see even very small deference of any sensor value, it can create a big trouble in your particular car, must need to get right diagnose and replace right parts which is the faulty, otherwise you be lost money for unnecessary things if you once get right diagnose you can see how easy and fast to find the problem and fix the car. is this information helped you.